No, as of the 7th of August Nigeria have not won any medals in the 2012 London Olympics.
Yes. Women's football will be the first event of the Olympics.
The first sport that will be featured in the 2012 Olympics is Women's football.
Sinivie Boltic is Flag bearer
The six London Summer Olympics 2012 football grounds are:City of Coventry StadiumHampden ParkMillennium StadiumOld TraffordSt James' ParkWembley Stadium